If you are pricing a pre-owned Vacheron Constantin right now, the information available to you is thinner than it should be. Patek Philippe has a deep secondary market literature: price guides, reference breakdowns, condition analyses. A. Lange & Sohne has attracted serious collector writing that tracks individual references over time. Vacheron, despite sitting in the same tier, gets a fraction of that coverage. According to one dealer-analysis source, the brand attracts roughly 25% of Patek's online search volume, a statistic that maps to what any active dealer actually sees: buyers coming in with real money and noticeably less information than they'd bring to a Patek conversation.That gap has consequences. Less signal means more noise. More noise means buyers either overpay because they anchored on retail, or they talk themselves into a project-condition watch because they couldn't find a clean comp. This piece tries to close that gap, reference by reference and condition grade by condition grade, using the same framework we've applied to Patek's perpetual and annual calendars.